The sequel to Boundary and Threshold. New York Times Best-Selling Author and a Rising Star of SF and Fantasy Continue their Popular Space Adventure Series.The sequel to Threshold, Book Three in the Boundary series. HELL FROZEN OVERMadeline Fathom had miraculously landed the crippled Nebula Storm on Europa. She joined on that frozen moon of Jupiter the stranded crewmembers of the ill-fated EU vessel  Odin. The Nebula Storm's reactor was ruined in the landing, the Odin’s shuttle can’t make the trip back home, and the only vessel that could have make the journey to save them has just been destroyed by a renegade crewman, bad luck, and the remorseless forces of nature.But Madeline, Helen Sutter, A.J. Baker and the team have one card left to play. All they have to do... is survive lethal radiation, vacuum, and ice as hard as steel while they figure out how to make  Nebula Storm fly again.But even as they prepare to make the journey home, Europa has one more discovery waiting for them... a discovery that might be the deadliest trap in the Solar System!Praise for previous books in this series: “. . . fast-paced sci-fi espionage thriller . . . light in tone and hard on science . . .” —Publishers Weekly on Boundary “The whole crew from Flint and Spoor's Boundary are back. . . . Tensions run high throughout the Ceres mission . . . a fine choice for any collection.” —Publishers Weekly on Threshold “[P]aleontology, engineering, and space flight, puzzles in linguistics, biology, physics, and evolution further the story, as well as wacky humor, academic rivalries, and even some sweet romances.” —School Library Journal on Boundary